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FRANÇAIS
5. Mesure
Valeur mesurée (EV)
2) Appuyer sur la touche de mesure r pour
mesurer. Relâcher la touche de mesure pour
achever la mesure et afficher la valeur mesurée
(EV).
La mesure consécutive sera exécutée pendant la
pression de la touche de mesure.
RÉFÉRENCE: EV (valeur d’exposition) est la lecture qui exprime de manière
logarithmique la quantité constante de lumière combinée de la
vitesse d’obturation et de la valeur d’ouverture.
Un changement d’1 EV fait doubler (ou réduit de moitié) la
quantité de lumière.
La relation entre la valeur d’ouverture (AV), la valeur de vitesse
d’obturation (TV = valeur de temps) et EV est EV = AV + TV.
Cette formule relationnelle permet le calcul du nombre de
manières selon lesquelles l’ouverture et la vitesse d’obturation
peuvent être combinées pour une certain EV constant.
En mode Priorité à la vitesse d’obturation en lumière ambiante,
si les touches Up et Down sont pressées après la mesure, la
valeur de vitesse d’obturation changera et la valeur d’ouverture
adéquate (valeur mesurée) s’affichera.
Tableau de contraste EV, valeur douverture & valeur de vitesse
dobturation
Laxe horizontal est pour les valeurs douverture et laxe vertical pour
les valeurs de vitesse dobturation. Les chiffres en gris indiquent EV.
15


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